I have talked to Cheetham before on the phone.
I met Neal at the MIT Summit in Cambridge, Mass.
As far as the theory goes, I guess I better "publish" it right here, right now, just in case someone else claims it.
In my opinion, the orientation of the 3-D machine should be 90° to the Horizontal Swing Plane (Plane Line, Direction of Swing) and NOT 90° to the target.
For example:
If Charles Howell hits 8° down on his driver at 45°, and Paula Creamer hits up 8° at 45°, then Howell would have to rotate his Horizontal Swing Plane-Plane Line-Direction of Swing 8° to the left to hit a straight ball with a square clubface at separation, and Creamer would have to rotate her Horizontal Swing Plane-Plane Line-Direction of Swing 8° to the right to hit a straight ball with a square clubface at separation.
Then, if both Howell and Creamer had IDENTICAL OPEN SHOULDERS that are 35° open to their Horizontal Swing Plane-Plane Line-Direction, the TARGET LINE ORIENTED 3-D machine would have Howell's shoulders about 43° open and Creamers only 27°!!!
And that would NOT be what they are actually doing.
You see.